Southern Ocean biogenic blooms freezing-in Oligocene colder climates
Crossing a key atmospheric CO(2) threshold triggered a fundamental global climate reorganisation ~34 million years ago (Ma) establishing permanent Antarctic ice sheets. Curiously, a more dramatic CO(2) decline (~800–400 ppm by the Early Oligocene(~27 Ma)), postdates initial ice sheet expansion but t...
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ftpubmed:oai:pubmedcentral.nih.gov:9646741 2023-05-15T13:50:18+02:00 Southern Ocean biogenic blooms freezing-in Oligocene colder climates Hochmuth, Katharina Whittaker, Joanne M. Sauermilch, Isabel Klocker, Andreas Gohl, Karsten LaCasce, Joseph H. 2022-11-09 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9646741/ http://www.ncbi.nlm.nih.gov/pubmed/36351905 https://doi.org/10.1038/s41467-022-34623-9 en eng Nature Publishing Group UK http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9646741/ http://www.ncbi.nlm.nih.gov/pubmed/36351905 http://dx.doi.org/10.1038/s41467-022-34623-9 © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . CC-BY Nat Commun Article Text 2022 ftpubmed https://doi.org/10.1038/s41467-022-34623-9 2022-11-20T02:08:30Z Crossing a key atmospheric CO(2) threshold triggered a fundamental global climate reorganisation ~34 million years ago (Ma) establishing permanent Antarctic ice sheets. Curiously, a more dramatic CO(2) decline (~800–400 ppm by the Early Oligocene(~27 Ma)), postdates initial ice sheet expansion but the mechanisms driving this later, rapid drop in atmospheric carbon during the early Oligocene remains elusive and controversial. Here we use marine seismic reflection and borehole data to reveal an unprecedented accumulation of early Oligocene strata (up to 2.2 km thick over 1500 × 500 km) with a major biogenic component in the Australian Southern Ocean. High-resolution ocean simulations demonstrate that a tectonically-driven, one-off reorganisation of ocean currents, caused a unique period where current instability coincided with high nutrient input from the Antarctic continent. This unrepeated and short-lived environment favoured extreme bioproductivity and enhanced sediment burial. The size and rapid accumulation of this sediment package potentially holds ~1.067 × 10(15) kg of the ‘missing carbon’ sequestered during the decline from an Eocene high CO(2)-world to a mid-Oligocene medium CO(2)-world, highlighting the exceptional role of the Southern Ocean in modulating long-term climate. Text Antarc* Antarctic Ice Sheet Southern Ocean PubMed Central (PMC) Antarctic Southern Ocean The Antarctic Nature Communications 13 1 |
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Article Hochmuth, Katharina Whittaker, Joanne M. Sauermilch, Isabel Klocker, Andreas Gohl, Karsten LaCasce, Joseph H. Southern Ocean biogenic blooms freezing-in Oligocene colder climates |
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Crossing a key atmospheric CO(2) threshold triggered a fundamental global climate reorganisation ~34 million years ago (Ma) establishing permanent Antarctic ice sheets. Curiously, a more dramatic CO(2) decline (~800–400 ppm by the Early Oligocene(~27 Ma)), postdates initial ice sheet expansion but the mechanisms driving this later, rapid drop in atmospheric carbon during the early Oligocene remains elusive and controversial. Here we use marine seismic reflection and borehole data to reveal an unprecedented accumulation of early Oligocene strata (up to 2.2 km thick over 1500 × 500 km) with a major biogenic component in the Australian Southern Ocean. High-resolution ocean simulations demonstrate that a tectonically-driven, one-off reorganisation of ocean currents, caused a unique period where current instability coincided with high nutrient input from the Antarctic continent. This unrepeated and short-lived environment favoured extreme bioproductivity and enhanced sediment burial. The size and rapid accumulation of this sediment package potentially holds ~1.067 × 10(15) kg of the ‘missing carbon’ sequestered during the decline from an Eocene high CO(2)-world to a mid-Oligocene medium CO(2)-world, highlighting the exceptional role of the Southern Ocean in modulating long-term climate. |
format |
Text |
author |
Hochmuth, Katharina Whittaker, Joanne M. Sauermilch, Isabel Klocker, Andreas Gohl, Karsten LaCasce, Joseph H. |
author_facet |
Hochmuth, Katharina Whittaker, Joanne M. Sauermilch, Isabel Klocker, Andreas Gohl, Karsten LaCasce, Joseph H. |
author_sort |
Hochmuth, Katharina |
title |
Southern Ocean biogenic blooms freezing-in Oligocene colder climates |
title_short |
Southern Ocean biogenic blooms freezing-in Oligocene colder climates |
title_full |
Southern Ocean biogenic blooms freezing-in Oligocene colder climates |
title_fullStr |
Southern Ocean biogenic blooms freezing-in Oligocene colder climates |
title_full_unstemmed |
Southern Ocean biogenic blooms freezing-in Oligocene colder climates |
title_sort |
southern ocean biogenic blooms freezing-in oligocene colder climates |
publisher |
Nature Publishing Group UK |
publishDate |
2022 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9646741/ http://www.ncbi.nlm.nih.gov/pubmed/36351905 https://doi.org/10.1038/s41467-022-34623-9 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Ice Sheet Southern Ocean |
genre_facet |
Antarc* Antarctic Ice Sheet Southern Ocean |
op_source |
Nat Commun |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9646741/ http://www.ncbi.nlm.nih.gov/pubmed/36351905 http://dx.doi.org/10.1038/s41467-022-34623-9 |
op_rights |
© The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
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CC-BY |
op_doi |
https://doi.org/10.1038/s41467-022-34623-9 |
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Nature Communications |
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1766253334183804928 |